An Experimental Study on the Fire Behavior of CFT Columns under the Constant Axial Loading Condition in Fire

Abstract:

The temperature of the steel tube of a CFT column rises rapidly upon a fire causing the deterioration of its strength, while the concrete inside of the tube having large heat capacity provides fire-resistance performance. In order to employ CFT columns as fire-resistant structure, it is necessary to conduct studies on the factors exerting influence on structural capacities and the influence associated with each condition. Concrete’s compressive strength, cross-sectional size, axial load ratio and boundary condition are the major factors which are influential in fire-resistance performance. In particular, boundary condition between columns and beams is one of the major factors which decide fire-resistance performance because it exerts influence on load carrying capacity. The result of the test conducted in this study showed that fire-resistance time of 106 minutes was secured in the specimens with clamped ends and that of 89 minutes in those with pinned ends when cross-sectional size was 360 by 360. In the specimens with cross-sectional size of 280 x 280, fire-resistance time of 113 minutes was secured under the condition of clamped ends and that of 78 minutes was secured under the condition of pinned ends.

• Periodical: Advanced Materials Research (Volumes 446-449)
• Pages: 1298-1306
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.446-449.1298
• Online since: January 2012
• Authors: Hyung Jun Kim, Heung Youl Kim, In Hwan Yeo
• Keywords: Boundary Condition, CFT Column, Fire Behaviour, Fire Resistant, Structure

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